Android Studio (Java)
Modify the Networking app (code given below):
Load a webpage that has at least two images
Analyze the text received and find the component
Analyze the html page received and fetch every images referenced by the page
Store the fetched images in a Bitmap array
Display the thumbnail images in a GridView
On touching each thumbnail in the GridView, display the full image
PLEASE INCLUDE ALL MODIFIED AS WELL AS ADDITIONAL FILES USED IN IMPLEMENTATION
PLEASE ALSO INCLUDE SCREENSHOTS OF THE OUTPUT
Current Networking App Output:
First add
activity_main.xml
xmlns_app=”http://schemas.android.com/apk/res-auto”
xmlns_tools=”http://schemas.android.com/tools”
android_layout_width=”match_parent”
android_layout_height=”match_parent”
android_id=”@+id/activity_main”
tools_context=”com.wenbing.networking.MainActivity”>
android_src=”@color/material_grey_300″
android_layout_width=”209dp”
android_layout_height=”272dp”
android_id=”@+id/imageView”
app_layout_constraintLeft_toLeftOf=”@+id/activity_main”
app_layout_constraintTop_toTopOf=”@+id/activity_main”
app_layout_constraintRight_toRightOf=”@+id/activity_main”
app_layout_constraintBottom_toBottomOf=”@+id/activity_main” />
MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.widget.ImageView;
import android.widget.Toast;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import java.io.InputStreamReader;
public class MainActivity extends AppCompatActivity {
ImageView img;
final private int REQUEST_INTERNET = 123;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.INTERNET)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.INTERNET}, REQUEST_INTERNET);
} else{
downloadSomething();
}
}
private void downloadSomething() {
String texturl = “http://academic.csuohio.edu/zhao_w/”;
String imgurl = “http://2.bp.blogspot.com/-us_u2PBLSOI/UqgPMh7ovjI/AAAAAAAACdI/ujdyGregs6Y/s1600/amazing-butterfly-hd-image.jpg”;
new DownloadImageTask().execute(imgurl);
new DownloadTextTask().execute(texturl);
}
@Override
public void onRequestPermissionsResult(int requestCode,
String[] permissions, int[] grantResults) {
switch (requestCode) {
case REQUEST_INTERNET:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
downloadSomething();
} else {
Toast.makeText(MainActivity.this,
“Permission Denied”, Toast.LENGTH_SHORT).show();
}
break;
default:
super.onRequestPermissionsResult(requestCode,
permissions, grantResults);
}
}
private InputStream OpenHttpConnection(String urlString) throws IOException
{
InputStream in = null;int response = -1; URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException(“Not an HTTP connection”);
try{
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod(“GET”);
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
} catch (Exception ex)
{
Log.d(“Networking”, ex.getLocalizedMessage()); throw new IOException(“Error connecting”);
}
return in;
}
private InputStream download(String URL) {
InputStream in = null;
try {
in = OpenHttpConnection(URL);
return in;
} catch (IOException e1) {
Log.d(“NetworkingActivity”, e1.getLocalizedMessage());
}
return null;
}
private Bitmap DownloadImage(String URL)
{
Bitmap bitmap = null;
InputStream in = download(URL);
if(in != null) {
bitmap = BitmapFactory.decodeStream(in);
try {
in.close();
} catch (IOException e1) {
Log.d(“NetworkingActivity”, e1.getLocalizedMessage());
}
}
return bitmap;
}
private class DownloadImageTask extends AsyncTask {
protected Bitmap doInBackground(String… urls) {
return DownloadImage(urls[0]);
}
protected void onPostExecute(Bitmap result) {
ImageView img = (ImageView) findViewById(R.id.imageView);
img.setImageBitmap(result);
}
}
private String DownloadText(String URL)
{
int BUFFER_SIZE = 2000;
InputStream in = download(URL);
InputStreamReader isr = new InputStreamReader(in);
int charRead;
String str = “”;
char[] inputBuffer = new char[BUFFER_SIZE];
try {
while ((charRead = isr.read(inputBuffer))>0) {
String readString = String.copyValueOf(inputBuffer, 0, charRead);
str += readString;
inputBuffer = new char[BUFFER_SIZE];
}
in.close();
} catch (IOException e) {
Log.d(“Networking”, e.getLocalizedMessage());
return “”;
}
return str;
}
private class DownloadTextTask extends AsyncTask {
protected String doInBackground(String… urls) {
return DownloadText(urls[0]);
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), result, Toast.LENGTH_LONG).show();
}
}
}
